To commercial window clean, a pole is usually needed and there are usually no screens and tracks. Although the price per pane is less, the applications differ greater than your residential window. There could be overhanging windows, harder to reach areas such as awnings, more glazing, and typically the glazing is tempered. Safety is more of a concern too, as more people are around commercial areas. For job pictured, there was a lot of tree debris that fell down onto panes, so we lifted a Shop Vac onto the awning and sucked up the tree sloughing. It made quite a difference!